Retreading and vulcanizing apparatus for tires



March 2,1\9:.6.` 1,575,434

A. MATTHEWS ET AL RETREADINGND VULCANIZING APPARATUS FOR TIRES Filed Nov. 14, 1924 g Hen/7^ WMU@ J Patented Map2, lgf y STATES isaiasi PrsNr vortica.

ALBERT MATTHEWS, vieron sT. CLAIR MALLET, Ann HENRY WILLIAM RAWLEY, or BRIGHTON, ENeLANn.

nnTnnanrNe AND AvuLunt-1zr-ure APraaATUs 'son TIRES.

Application med November 14, 1924. Serial Nof749,905.

T allwhom t may concern.'

Be it known that we, ALBERT MATTHEWS, VICTOR ST. CLAIR MALLEY and HENRY WIL- LIAM RAWLEY, subjects `of the King of Great Britain, residing at 2 Park Road Terrace,

.18v Grafton Street, and Tuanda, 1 Grantham Road, respectively, all inBrighton, Sussex', England, have invented improvements in Retreading and Vulcanizing Apparatus for Tires; and we do hereby declare that the lfollowing to be a full, clear, and exact description in the invention, such as will enable others skilled in the art to` which it appertains to make and use the same.

The object oi. this invention is to provide in a plant for retreading re-.rubbering and vulcanizing tires means whereby adjustment 4of a single plant may be Vreadily ellected to accommodate various dimensions of tires.

Broadly our invention resides in the provision of a mould which can be adjusted to accommodate different dimensions of tires. According to the preferred embodiment of our invention a plant of the character speci- 25' iiedcomprises a frame upon which are supported a pair of parallel corresponding arcuate members adapted to be adjustably spaced and to receive between them a detachable matrix and the tire to be treated, means for applying heat directly to said matrix, and transversely adjustable means for applyinr pressure to the tire. Y In order that the invention may be clearly v understood and readily carried into eect an embodiment ot same will now be described by aid of the accompanying drawings, wherein j g liig. 1 is a side elevation ot the plant, Fig. 2 is a cross sectional view of .the mould on the line 21- E of Fig. 1, and employing an air bag during treatment of the 1 beads and juxtaposedparts of the tire.

Referring to the drawings the plant comprises a frame or stand 1 adapted to be bolted or otherwise secured to a suitable. base 2 and the upper surface of this traine is recessed arcuatel tor the' reption of a correspondingly s aped mould 3 constituted by one or more segmental members shaped internally to accoodate 'a portion ot' the tire. 4 f

The mould is divided-along itslongitudinal centre Iasiat 5 'and bolts dare trapsversely'through the @Wo Sections propassed vided by such division whereby the eiectivewidth of the mould may be adjusted by adjusting the nuts 7 of these bolts. A matrix 8 corresponding to the required tread of the tire is detaohably inserted in a channel 9 in the longitudinal centre of the mould, whereby any particular design of tread ma y be selected by employing a number of interchangeable matrices. Located in a space 10 between the frame 1 and the mould 3 or within a channel in the upper surface'of the frame'l is a length, ora pluralityvlof lengths of piping 1l having jets y12 whereby gas llames can impinge on to the mould 3 and matrix 8 and so maintain i same at the requisite degree of heat, the inatrix receiving the most heat. To avoid overlheating athermostatic valve-13 is included with the mouldand isincluded in fthe gas conductors 14 whereby overheating is automatically compensated for by a reduction in the supply of gasin well known manner. .By ,v this means of heating, the apparatus can be relied upon to worlr at any predetermined 'temperature and further obviates the existing complicated and expensive steam jack- 80,

ets, boilers steamV pipes and other accessoriesdependentupon steam heating, and further no provision is necessary to prevent leakage of steam at joints as is at present essential.l t will'be. apparent that electrical heating may be employed and the temperature controlled instead of or iu addition to gas.

The two divided portions of the mould are bridged across the top by a number of movably supportedcross bars 15 eachlof which` carries atI about its median position a vertical adjustable screw 16 carrying at its base a head 17 adapted 4to be engaged with the usual sand or. air bag 18 positioned inside the tire being treated. Each head preferably carries a strong coiled, laminated or leaf spring 19 whereby a resilient pressing action is obtained when using a sand bag.

When a complete re-rubberingl of the walls and beads of a tire is required, a bead and side wall mould 23 (Fig. 2) is provided adapted to acooodate the portion of the tire in juxta osition to the beads such mould 23 preferab y comprising two symmetrical halves as -shown'in Fig. 2 to allow for adjustment ot the mould 3. When the tire is being retreaded a sand bag 26 v vould be empieyed in Innern manner am; heads l? side with their springs 19 engaged directly against the sand bag.

To ensure the vertical pressure screw`s 16 always being located over the .longitudinal centre line of the mould, cach cross bar is self centering and adjustable and is capable 'of movementJ transversely across the top of the mould, and this may be effected byy supporting each cross barwith a pair of upstanding bifurcated lugs 20 secured to, opfosite sides ofthe mould, the cross bar rest- 1`ng between the furcations of the lugs, andengaging rollers 21 carried by pins passed through the fui-cations across the top surface of the cross symmetrically curved so that any upward pressure through the lvertical adjusting screws `will result in the cross bars adjusting themselves owing to their free sliding action against the rollers. However it is ap parent that adjustment by hand if necessary will be a very simple matter.

Instead of employing the screw as above described for eiecting pressure on the tire, Aany known method of air pressure may be employed.

The ends of the mould are provided'with i i a plurality of cooling blades 22 for preventing -'overcuring of the overlap section of the tire.

A-retreading or vulcanizing/plant accordi ing to our invention effects a great economy ing said memberwith said mould to permit correct positioning of in fuel, as unnecessaryv radiation or excessive4 heating is automatically prevented. l

What we claim is:

1. In a tire vulcanizer, a tire receiving mould having spaced side portions, means 'for applying pressure to a tire disposed within saidl mould comprising a member bridging the side portions of said mould and carrying a clamp screwl for applying said pressure,- and means slidably connectsaid clam screw with respect to a' tire disposed wit in the mould. bar, the arms preferably beine:

2. In -a tire vulcanlzer, a tire receiving mould having spaced-side portion, means for applying pressure tofa tir'e disposed within saidmo111d comprising la member bridging the. siderportions of said mould and carrying a clamp screw for applying said pressure, and rollers carried by or said member whereby -the latter is freely movable to permit correct positioning of said clam screw with respect to a tire disposed wit in the' mould.

- ln witness whereof we have signed this specication.

ALBERT MATTHEWs VICTOR sT. CLAIR MALLEY. HENRY; WILLIAM RAWLEY.

the side v ortions o-sald mould providing bearmgs the Vside portions of 

